body {
	background: url(../img/1.jpg) no-repeat center center;
	background-size: cover;
	background-attachment: fixed;
	animation-name: myfirst;
	animation-duration: 12s;
	/*变换时间*/
	animation-delay: 2s;
	/*动画开始时间*/
	animation-iteration-count: infinite;
	/*下一周期循环播放*/
	animation-play-state: running;
	/*动画开始运行*/
}

@keyframes myfirst {
	0% {
		background: url("../img/1.jpg") no-repeat center center;
		background-size: cover;
		background-attachment: fixed;
	}
	34% {
		background: url("../img/2.jpg") no-repeat center center;
		background-size: cover;
		background-attachment: fixed;
	}
	67% {
		background: url("../img/3.jpg") no-repeat center center;
		background-size: cover;
		background-attachment: fixed;
	}
	100% {
		background: url("../img/1.jpg") no-repeat center center;
		background-size: cover;
		background-attachment: fixed;
	}
}

.form {
	background: rgba(255, 255, 255, 0.2);
	width: 400px;
	margin: 120px auto;
}


/*阴影*/

.fa {
	display: inline-block;
	top: 27px;
	left: 6px;
	position: relative;
	color: #ccc;
}

input[type="text"],
input[type="password"] {
	padding-left: 26px;
}

.checkbox {
	padding-left: 21px;
}